Editor's Review
Alarms that never fire, fitness trackers that lose an hour, messengers that deliver notifications only once you open them - these are usually not app bugs. They are manufacturer battery optimisation shutting down background processes far more aggressively than Android itself intends. Petr Nalevka, who writes Sleep as Android under the Urbandroid name, has spent years documenting that behaviour, and this is the measuring instrument for it.
The test is simple and demands patience. Start a benchmark, leave the phone alone for several hours, and the app records how much delay your device introduced into work that was supposed to run on schedule. The result is a score comparable against other handsets from the same manufacturer, and the data feeds the public dontkillmyapp.com database. Alongside the benchmark it links to the per-vendor instructions for whitelisting apps, disabling adaptive battery and finding the menus each manufacturer buries this in.
The honest limitation:
It diagnoses, it does not repair. No app can override a vendor's power management from userspace. What you get is evidence that the phone is at fault rather than the software you were blaming, plus a set of steps to try. That is genuinely valuable after months of chasing the wrong culprit, and worthless if you were hoping for a switch that makes the killing stop.
It is also a paid listing with no free tier, which is fair enough for a diagnostic most people run a handful of times, but worth knowing before you tap buy.
Features
Background benchmark measuring how much your device delays scheduled work
Score comparable against other handsets from the same manufacturer
Links to the vendor settings that reduce background killing
Results contributed to the public dontkillmyapp.com database
Pros
Gives evidence about which side the problem is on, phone or app
Written by a developer with a long record on Android background behaviour
Points directly at the vendor menus that actually change the behaviour
No advertising and no subscription attached
The test runs unattended while you get on with something else
Cons
Measures the problem but cannot stop the system killing apps
Paid up front with no free version to try first
Questions people ask
Will this stop my phone killing apps?
No, and no app can. Vendor power management runs below the level an ordinary app can reach. What this one does is measure the damage and show you which settings on your specific manufacturer reduce it, such as whitelisting an app or turning off adaptive battery.
Why does the test take so long?
Because the behaviour it measures only appears once the phone has been idle for a while. A short test would miss it entirely. Start the benchmark, leave the device alone, and read the result later.
Is it worth paying for?
It is a diagnostic rather than a daily tool, so the answer depends on how long you have been fighting missed alarms or lost notifications. If you have been at it a while, the evidence is worth more than the price. If your apps run fine, you do not need it.
